Improvement in mould for casting- metals



ne moi i Sister EDWIN N. CLEAVES, OF BOSTON, MASSACHUSETTS.

Letters Patent No. 87,091,

dated February 23, 1869.

IMPROVEMENT IN MOULD FOR CASTING METALS To all to whom these presents shall come Be it knc wn that I, EDWIN N. GLnAvEs, of Boston, in the county of Suffolk, and State of Massachusetts, have made an invention of a new and useful Improvement in Moulds for Casting Metallic Articles; and do hereby declare the following to be a full, clear, and exact description thereof, due reference being had to the accompanying drawings, making part of this specification, and in which Figure 1 is a part'elevation and part section of a mould made in accordance with my invention.

Figure 2, a siderrepresentation of its male portion, or core, as removed from the mould.

This invention is an improvement in that class of moulds employed for casting soft metallic articles, principally those composed of Britannia, so called,and relates to means for ejecting the article from contact with the core of the mould after casting. Y The invention consists in the interposition, between the outer shell, or jacket of the mould, and its inner male portion, or 4 core, of a ring, backed by a circular disk, which is secured to it in a suitable manner, the depth of the ring being somewhat greater than that of the core, and the latter being provided witha central shank, for guiding its movements, and with a spring, or other equivalent device, for forcing it forward in contact with the ring, and the whole being combined and operating as hereinafter referred to.

In the drawings, before mentioned as illustrating my invention A denotes a mould for casting Britannia caster-bottime, or stands, the outer shell or matrix of such mould being shown at B, and the inner male portion, or core, as it is termed, at 0, such parts being tapering or conical in form, with an undulating outline, and of such size as to leave a space of uniform depth between the two, in the ordinary manner of such articles. 7

In carrying out my invention, I form upon the upper part, or edge of the core 0, a circumscribing ring, in order to leave an outstanding or projecting lip, D, as represented.

E denotes an annulus, formed with a concentric inner lip, the size and shape of this ring E being such as not only to lap over and enclose the core 0, but to abut against or be stopped by the lip l) of the latter, the depth of the ring, as before observed, being some- What greater than that of the said lip D, in order to allow of considerable longitudinal play of the latter within. the former.

A disk, F, provided, upon its outer face, with a central projecting handle, G, is screwed or otherwise secured, face to face, to the inner side of the annulus E.

The said handle G is tubular, and serves-to receive, somewhat loosely, a shank, H, projecting inward from the core 0, the depth of the bore of the handle G being somewhat in excess of the shank, to permit of a short movement of the latter therein.

A coiled orother suitable spring, I, is interposed between the core-Q and the disk G, for the purpose of separating the two, or of maintaining a yielding union of the core and the annulus E.

In operating with the above-described mould, the outer shell, or jacket, is to be fixed in its proper position, and the metal run into, or cast between it and the core 0, and-the shell subsequently removed in the usual manner, which leaves the article, thus cast, adhering with considerable tenacity to the core.

To free this article from its hold upon the core, and

to eject it therefrom, the moulder has only to give asharp, quick blow upon the end of the handle, or to force such handle quickly against any unyielding object. The momentum created by this movement upon the mould being suddenly arrested. has the effect of forcing such core inward, and freeing it from contact with the casting, thus allowing it to drop, or be removed therefrom, the spring I instantly returning the core to its normal position against the annulus E, in readiness for a new casting.

By the employment of the core H in my invention, such core is at all times caused to move in a uniform axial line, with respect to the annulus E, thus avoiding possibility of cracking of the casting, which now often takes place in the attempts to remove it, owing to unequal movements of the casting upon the core.

In the majority of Britannia-moulds, as heretofore made, the casting adheres very obstinately to the core, and moulds are often broken in the attempt to remove them. The time consumed in removing the, casting also allows the mould to become cool to a considerable extent, the objection to which is well known to persons conversant with the craft to which my invention appertains, and to whom this specification is chiefly addressed.

In the use of my invention,'a' breakage of the mould never takes place, thus effecting one point of economy,

and, owing to the cost of the mould, a considerablev Claims.

1. I claim-the combination,- with the matrix, or outer shell of the mould, of the core and spring for holding said core in position in the matrix, with a yielding pressure, substantially as and for the purposes described.

2. 'In a mould, such as described, I also claim the combination, with the disk F and its hollow stem or handle, of the annulus E, the core 0, the shank, or its equivalent, for centring said core, and the spring I,

under the arrangement and for operation substantially as shown and set forth.

EDW'JN N. OLEAVES. Witnesses:

FRED. Oon'rrs, EDWARD GRIFFITH. 

